import tensorflow as tf
a = tf.constant('ss')
sess = tf.Session()
aa = sess.run(a)
print(aa)



import tensorflow as tf
a = tf.constant(3)
b=tf.constant(4)
ab=tf.add(a,b)
sess = tf.Session()
aa = sess.run(ab)
print(aa)


import tensorflow as tf
a = tf.constant(3)
b=tf.constant(4)
c=tf.placeholder(tf.float32,shape=None,name='sss')
ab=tf.add(a,b)
sess = tf.Session()
aa = sess.run(ab,feed_dict=c)
print(aa)
